Works 100% (so far) on my 2012 Nexus. Would perhaps be helpful if people on other platforms tried this.
1) Lock first ball.
2) Let second ball drain.
3) Lock third ball.
4) Lock fourth ball.
The fourth ball is spat back out.
5) Lock fourth ball again.
This time it locks correctly, and starts multiball. Intuitively, it looks like some counter is being reset when it shouldn't be when you drain a ball - note that the green arrow signifying that a ball is locked goes out when you drain, but the ball is still visible in the lock.
Edit -
This also works, to hammer home the point.
1) Lock first ball.
2) Let second ball drain.
3) Lock third ball.
4) Let fourth ball drain.
5) Lock fifth ball - spat back out.
6) Lock fifth ball again - spat back out.
7) Lock fifth ball again - multiball starts.
1) Lock first ball.
2) Let second ball drain.
3) Lock third ball.
4) Lock fourth ball.
The fourth ball is spat back out.
5) Lock fourth ball again.
This time it locks correctly, and starts multiball. Intuitively, it looks like some counter is being reset when it shouldn't be when you drain a ball - note that the green arrow signifying that a ball is locked goes out when you drain, but the ball is still visible in the lock.
Edit -
This also works, to hammer home the point.
1) Lock first ball.
2) Let second ball drain.
3) Lock third ball.
4) Let fourth ball drain.
5) Lock fifth ball - spat back out.
6) Lock fifth ball again - spat back out.
7) Lock fifth ball again - multiball starts.
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